Feb 13 (Island) ITAK led TNA run Northern Provincial Council (NPC) has reiterated its call for a UN investigation into what it calls genocide committed by successive Sri Lankan govts since 1948, in spite of Mavai Senathirajah, General Secretary of both organisations, ruling out a wider UN role here. Senathirajah last August dismissed a call by a group of 33 members of Northern and Eastern PCs for UNHRC to expand